For the large-scale elevated bridges located in coastal mudflats or shallow sea, the full-span prefabricated concrete box girders can fully play the scale advantage and have the good technology and economical efficiency because of the good manufacturing quality and structural durability under the condition of having temporary facilities such as large-scale prefabrication yards. Due to the need for multiple site transfers during the construction of prefabricated box girders and the large hoisting weight, the necessary special designs are required. Combined with the Hangzhou-Ningbo Expressway Duplex Line (Ningbo Section) Phase I Project, through the refined analysis on the hoisting condition, the hoisting scheme of vertical precisely-rolled threaded steel bars outside the web is studied to improve the hoisting force state and technical economy.